Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a72763762faca9d…

MALICIOUS

PDF

38.6 KB Created: 2020-05-02 13:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: b2f4c709f92675b5d7b646a903b4b777 SHA-1: f51700f4d48667f15370572576d48eb67c34878e SHA-256: 3a72763762faca9d510796f2ea3f3210b623d62541c8727184589184fc88525e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the embedded URLs and the sheer volume of outbound links suggest an attempt to manipulate search engine results or distribute malicious content via these external resources. The document body contains garbled text and some of the extracted URLs, reinforcing the link farm activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://brandstormpromotions.net/uploads/1/3/0/4/130483114/130483114.html#guideposts+trust+watford PDF link annotation
    • http://adoptme.info/uploads/1/3/0/4/130488196/9656743.pdfIn PDF document text
    • http://misspurcellsclassroom.com/uploads/1/3/0/9/130969653/dofijuxibevuvaf-nomiweveg-bewuvatasax-pijifogerebo.pdfIn PDF document text
    • http://scottbdyer.com/uploads/1/3/1/4/131408899/mijirixa_dagidon.pdfIn PDF document text
    • http://toscanajoyasyaccesorios.com/uploads/1/3/1/3/131398004/183896f8fb.pdfIn PDF document text
    • http://unbreakablecarriereno.com/uploads/1/3/0/2/130289776/mozowataxal.pdfIn PDF document text
    • http://blueoceanapparel.net/uploads/1/3/0/7/130738504/64985dc6773d7.pdfIn PDF document text
    • http://dominomanagement.net/uploads/1/3/0/4/130476671/e1f6608438265d.pdfIn PDF document text
    • http://wethepeopleyoga.com/uploads/1/3/1/1/131163599/nalomogizen.pdfIn PDF document text
    • http://imagebackgroundremoval.com/uploads/1/3/0/6/130620492/1458754.pdfIn PDF document text
    • http://chrisholdenonline.com/uploads/1/3/0/4/130494389/vijidal.pdfIn PDF document text
    • http://ntlongstudio.com/uploads/1/3/0/2/130270882/8433790.pdfIn PDF document text
    • http://tatina.net/uploads/1/3/0/7/130740493/vekus_lasevebilode_terobidejuw.pdfIn PDF document text
    • http://kwikykit2018.com/uploads/1/3/0/5/130588294/bubejo.pdfIn PDF document text
    • http://nc-zeitgeist-foundation.org/uploads/1/3/0/6/130639859/biwedunijinipe-lutakiwe-sixopunarito.pdfIn PDF document text
    • http://fintech-up.com/uploads/1/3/0/2/130289367/vesaxuz.pdfIn PDF document text
    • http://portsofcallresortblog.com/uploads/1/3/0/5/130539849/f0e1476ba704955.pdfIn PDF document text
    • http://aquasearchglove.com/uploads/1/3/1/4/131454699/lisitebo-fizedapomuti-lufotexe.pdfIn PDF document text
    • http://conconprints.com/uploads/1/3/0/6/130640231/rorurusebawofinofune.pdfIn PDF document text
    • http://wandafulproductions.com/uploads/1/3/0/7/130740625/wekufevisikasi-xatoguzataba.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C84 8332 bytes
SHA-256: 6ead07f075a06344a67b0c398db3947484146b94ce79c9b2f4de834e367ae19d

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